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RFC 1700 - tcp-parameters

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    TCP OPTION NUMBERS

    The Transmission Control Protocol (TCP) has provision for optional
    header fields identified by an option kind field.  Options 0 and 1 are
    exactly one octet which is their kind field.  All other options have
    their one octet kind field, followed by a one octet length field,
    followed by length-2 octets of option data.

    Kind   Length   Meaning                           Reference
    ----   ------   -------------------------------   ---------
      0        -    End of Option List                 [RFC793]
      1        -    No-Operation                       [RFC793]
      2        4    Maximum Segment Size               [RFC793]
      3        3    WSOPT - Window Scale              [RFC1323]
      4        2    SACK Permitted                    [RFC1072]
      5        N    SACK                              [RFC1072]
      6        6    Echo (obsoleted by option 8)      [RFC1072]
      7        6    Echo Reply (obsoleted by option 8)[RFC1072]
      8       10    TSOPT - Time Stamp Option         [RFC1323]
      9        2    Partial Order Connection Permitted[RFC1693]
     10        5    Partial Order Service Profile     [RFC1693]
     11             CC                                 [Braden]
     12             CC.NEW                             [Braden]
     13             CC.ECHO                            [Braden]
     14         3   TCP Alternate Checksum Request    [RFC1146]
     15         N   TCP Alternate Checksum Data       [RFC1146]
     16             Skeeter                           [Knowles]
     17             Bubba                             [Knowles]
     18         3   Trailer Checksum Option    [Subbu & Monroe]
     19        18   MD5 Signature Option            [Heffernan]

    TCP ALTERNATE CHECKSUM NUMBERS

    Number	Description			Reference
    ------- ------------------------------- ----------
       0    TCP Checksum                    [RFC-1146]
       1    8-bit Fletchers's algorithm     [RFC-1146]
       2    16-bit Fletchers's algorithm    [RFC-1146]
       3    Redundant Checksum Avoidance    [Kay]

    REFERENCES

    [KAY] Kay, J. and Pasquale, J., "Measurement, Analysis, and
          Improvement of UDP/IP Throughput for the DECstation 5000,"
          Proceedings of the Winter 1993 Usenix Conference, January 1993
          (available for anonymous FTP in
          ucsd.edu:/pub/csl/fastnet/fastnet.tar.Z).

    [RFC793] Postel, J., "Transmission Control Protocol - DARPA Internet
             Program Protocol Specification", STD 7, RFC 793, DARPA,
             September 1981.

    [RFC1323] Jacobson, V., Braden, R., and D. Borman, "TCP Extensions for
              High Performance", RFC 1323, LBL, ISI, Cray Research, May
              1992.

    [RFC1072] Jacobson, V., and R. Braden, "TCP Extensions for Long-Delay
              Paths", RFC 1072, LBL, ISI, October 1988.

    [RFC1693]  ?????

    [RFC1146] Zweig, J., and C. Partridge, "TCP Alternate Checksum
              Options", RFC 1146, UIUC, BBN, March 1990.

    PEOPLE

    [Braden]  Bob Braden, , March 1995.

    [Bridges] Monroe Bridges, , September 1994.

    [Heffernan] Andy Heffernan, , March 1995.

    [Knowles] Stev Knowles, , March 1995.

    [Kay] J. Kay, , Septermber 1994.

    [Subbu] Subbu Subramaniam, , September 1994.

    []

Connected: An Internet Encyclopedia
RFC 1700 - tcp-parameters